Have a claim open via EUclaim for 2 AZ flights (connection). First tried AZ directly, they claim the delay was due to congestion in Rome (we flew straight in, couldn’t be better).
Since March EUclaim is trying, they were also told due to ATC congestion. EUcliam claim told me in June that they will start a court case. In August got a message from them stating that they have not forgotten but they serve court cases based on who's nearest to the expiration of 2 years after flight was taken. Have not heard back since so I presume they are serving others first.

My claim is for 400 euros.